An Arctic air mass kept its grip on much of the central and eastern U.S. on Friday, plunging temperatures to record lows as snow blanketed central Colorado and the Pacific Northwest braced for an ...

A bitter blast of Arctic air – which is related to the polar vortex – is roaring south across the central U.S. Tuesday, bringing with it record-cold temperatures and "dangerously" low wind chills.

Arctic air remains into Saturday after a warm start to the week gave way to bitter cold, sending the mercury into the 20s midweek and bringing wind chill levels in the single-digits in some areas.

An Arctic air mass kept its grip on much of the central and eastern U.S. on Friday, plunging temperatures to record lows as snow blanketed central Colorado and the Pacific Northwest braced for an ...